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}

@article{caftan1904structure,
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  year={1909}
}
@book{kobayashi1963foundations,
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}
@article{arnol2004hilbert,
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@article{weinstein1996groupoids,
  title={{Groupoids: unifying internal and external symmetry}},
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}
@misc{vakil,
author={Ravi Vakil},
title={Foundations of Algebraic Geometry},
howpublished={Lecture notes, online at \url{http://math.stanford.edu/~vakil/216blog/}}
}

